AEG Electrolux ERN 2922 User Manual download pdf (Page 41)

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Fig. Fig. I.

Schematic diagram of timer,

buzzer, logic and synthesizer

por-

tions of alarm circuit.

standby

mode, if any

attempt

is

made to gain entry by opening

a door

or

window (or

move your

protected

vehicle) will

cause

!C2 to trigger.

When

this

occurs,

!C2 triggers on

and

its

output

at pin 3

signals

IC3

to

turn on

for almost

11 seconds (given

by T2 =

1.1 R7C6).

The T2 period

is

the time

you

have to disarm

the

alarm before

the buzzer

sounds.

During the 11- second period

in

which

the timer is

in

countdown

mode, the speech synthesizer

will

be

vocalizing the countdown, starting

at nine and counting

down to

zero. If

the alarm

has not been disabled be-

fore

the count

reaches zero, the out-

put of

!C3 at pin 3 biases on

transis-

tor Ql

for

a period of

approximately

220 seconds (given by

T3 = 1.1

R9C8).

This is how long the buzzer

will

sound

before the alarm

shuts off and

resets itself. When

monostable timer

IC3 shuts off,

it

goes

into standby

until the

next

pulse

(generated again

by an

intrusion).

Diode Dl and capacitors CIO and

CH in parallel

with

piezoelectric

buzzer PBI are used to

trap spikes

that can disrupt operation

of timers

!C2

and

IC3.

Note in Fig. 1 that the timer and

buzzer

sections

of the circuit

are sup-

plied from a 12 -volt dc source,

while

the

remainder of the circuitry

is

pow-

ered by a 5 -volt dc source.

The latter

is obtained

from the + 12 -volt line by

passing

it

through

voltage

regulator

/C4. The + 12 -volt line, as shown

in

Fig. 2, is

obtained

by passing the

raw

dc from bridge

rectifier RECTI

and

filter

capacitor

C26 through the /C12

+ 12 -volt regulator.

The SP0256 -AL2 speech

proces-

sor integrated circuit specified

for

/CIO is

a

single -chip n- channel

MOS

LSI

device

whose

internal circuitry

is

capable of synthesizing

speech and

Say You Saw It

In Modern

Electronics

February 1988

/ MODERN ELECTRONICS

/

51

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